There are some boats listed for sale on Craigslist. Since there has been no response here, you may want to contact one of those sellers for some pictures - and you may find one close to you that you could look at.
Alternatively, you could post some pics of your boat showing lower mast & boom and the deck layout which will likely prompt some assistance/advice from folks on Sailnet.
Also, let us know where you are located and you may find someone on here willing to help you.
Likely 5/16 - 3/8 inch polyester double braid will work for your sheets and 1/4 inch for control lines like vang & traveler. The lenghts are pretty easy to determine with a tape measure but check back in if you need specific help with that.